Copyright: Tracy J. ThomasFamily Sulidae (Gannets and Boobies), Family Anhingidae (Anhingas and Darters), Family Phalacrocoracidae (Cormorants and Shags), Family Fregatidae (Frigatebirds), Family Pelecanidae (Pelicans) and Family Phaethontidae (Tropicbirds) are the six families that fall into the bird order Pelecaniformes. Inhabitants of inland and marine waters, these aquatic birds are found worldwide. Pelecaniformes are of medium to large size and feed primarily on squid and fish though occasionally consume reptiles, amphibians, invertebrates, mollusks and crustaceans.
The species in the order Pelecaniformes are the only bird species with webbing between all four toes and they contain a gular sac in their throat. Their webbed feet are utilized for steering and propulsion in the water. The gular sac is utilized to scoop up fish or to create a flashy exhibit while courting. Small or closed nostrils help prevent water from entering their airways when they go below the surface while feeding. Some Pelecaniformes are plunge-divers with surface feathers that reduce buoyancy and allow them to dive underwater from great heights for their prey while others are surface feeders with water-repellent plumage that allow them to float with ease...read more
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